Sony CDX-GT400 CD/MP3/WMA Receiver CD player with built-in amplifier (17 watts RMS/52 peak x 4 channels) plays CDs, CD-Rs, and CD-RWs (including discs loaded with MP3, WMA, and ATRAC3plus music files) seven switchable background colors EQ3 (seven preset tone curves and a 3-band equalizer) 24-bit digital to analog converter